Difference between revisions of "ESP Column Information"
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Sieve Tray: Four input parameters | Sieve Tray: Four input parameters | ||
− | + | <ol start="1"> | |
+ | <li>. Column diameter (coldia): </li> | ||
If not entered, ESP calculates diameter using Reference 1. | If not entered, ESP calculates diameter using Reference 1. | ||
− | su = 0.65d0/dsqrt(denv*0.062428d0) | + | ''su = 0.65d0/dsqrt(denv*0.062428d0)'' |
− | calcdiam = dsqrt(av*4.0d0/(pi*su)) | + | ''calcdiam = dsqrt(av*4.0d0/(pi*su))'' |
+ | |||
where, | where, | ||
− | su = Superficial gas velocity, m/sec | + | ''su = Superficial gas velocity, m/sec'' |
− | denv = Vapor density, kg/m3 | + | ''denv = Vapor density, kg/m3'' |
− | av = Vapor flow rate, m3/sec | + | ''av = Vapor flow rate, m3/sec'' |
− | 0.65 = Gas phase | + | ''0.65 = Gas phase kinetic-energy term (F factor), unit-less'' |
− | calcdiam = calculated diameter, m | + | ''calcdiam = calculated diameter, m'' |
Please note, unit conversions are not shown in the equations. | Please note, unit conversions are not shown in the equations. | ||
Line 26: | Line 28: | ||
pages 18-6. | pages 18-6. | ||
− | + | <li>. Weir height (hweir):</li> | |
+ | |||
If not entered, hweir = 1.0 inch. | If not entered, hweir = 1.0 inch. | ||
− | + | ||
− | If not entered, ESP calculates the clear liquid height or the | + | * Clear liquid height (hl): |
− | height of crest over wire (hl) using Reference 2. | + | |
− | hl = 664.d0*(al/lw)**(0.667)*1.0d-3 | + | If not entered, ESP calculates the clear liquid height or the height of crest over wire (hl) using Reference 2. |
+ | |||
+ | hl = 664.d0*(al/lw)**(0.667)*1.0d-3 | ||
+ | |||
where | where | ||
− | al = Liquid flow rate, m3/sec | + | |
− | lw = Weir length, m | + | al = Liquid flow rate, m3/sec |
− | hl = Clear liquid height, m | + | |
− | The weir length (lw) is calculated from a correlation using | + | lw = Weir length, m |
− | Reference 2. | + | |
− | + | hl = Clear liquid height, m | |
− | lw = exp(log(al/6.309d-5)/25)/2.5d0 * 0.3048d0 | + | |
+ | The weir length (lw) is calculated from a correlation using Reference 2. | ||
+ | |||
+ | lw = exp(log(al/6.309d-5)/25)/2.5d0 * 0.3048d0 | ||
+ | |||
Reference 2: Perry’s Chemical Engineer’s handbook, 6th Edition, | Reference 2: Perry’s Chemical Engineer’s handbook, 6th Edition, | ||
pages 18-10,11. | pages 18-10,11. | ||
− | + | ||
− | If not entered, hf = 2.0*hl. | + | <li>. Froth height (hf):</li> |
− | For sieve tray, the weir length information is accounted in our model. | + | |
− | Weir height is the only parameter set as default unless it is a user | + | If not entered, |
− | input. Hole diameter and/or arrangements are not required in the | + | hf = 2.0*hl. |
− | currently implemented model, however, current model uses above | + | |
− | information plus diffusivity, Schimdt number, porosity of froth and other | + | For sieve tray, the weir length information is accounted in our model. Weir height is the only parameter set as default unless it is a user input. Hole diameter and/or arrangements are not required in the currently implemented model, however, current model uses above information plus diffusivity, Schimdt number, porosity of froth and other readily available data to calculate interfacial area per unit froth volume and finally mass transfer coefficients in the gas and liquid phase. More details about OLI’s Sieve tray can be found in Reference 3. |
− | readily available data to calculate interfacial area per unit froth | + | |
− | volume and finally mass transfer coefficients in the gas and liquid | ||
− | phase. More details about OLI’s Sieve tray can be found in Reference 3. | ||
Reference 3: Moniuk, W., Bekassy-Molnar, E., Mustafa, H. and Pohorecki, | Reference 3: Moniuk, W., Bekassy-Molnar, E., Mustafa, H. and Pohorecki, | ||
R., “Absorption of carbon dioxide into sodium hydroxide solutions in a | R., “Absorption of carbon dioxide into sodium hydroxide solutions in a | ||
sieve plate column”, Hungarian Journal of Industrial Chemistry, 17 | sieve plate column”, Hungarian Journal of Industrial Chemistry, 17 | ||
(1989), 93-105. | (1989), 93-105. | ||
+ | |||
+ | |||
Valve Tray: Two input parameters | Valve Tray: Two input parameters | ||
− | + | ||
+ | * Column diameter (coldia): | ||
If not entered, ESP calculates diameter using Reference 1 as shown | If not entered, ESP calculates diameter using Reference 1 as shown | ||
in Item 1 for Sieve Tray. | in Item 1 for Sieve Tray. | ||
− | + | ||
− | If not entered, hweir = 1.0 inch. | + | * Weir height (hweir): |
− | No other information is required for the currently implemented model. | + | |
− | The valve tray model uses flow rates, Reynolds number, Schimdt number | + | If not entered, hweir = 1.0 inch |
− | and above two tray hydraulics data to calculate interfacial area and | + | . |
− | finally mass transfer coefficients. Details of the OLI’s Valve tray model | + | No other information is required for the currently implemented model. The valve tray model uses flow rates, Reynolds number, Schimdt number and above two tray hydraulics data to calculate interfacial area and finally mass transfer coefficients. Details of the OLI’s Valve tray model |
can be found in Reference 4. | can be found in Reference 4. | ||
+ | |||
Reference 4: Scheffe, R.D. and Weiland, R.H., “Mass-Transfer | Reference 4: Scheffe, R.D. and Weiland, R.H., “Mass-Transfer | ||
Characteristics of Valve Trays”, Industrial & Engineering Chemistry | Characteristics of Valve Trays”, Industrial & Engineering Chemistry | ||
Research 26 (1987), 228-236. | Research 26 (1987), 228-236. | ||
− | Bubble Cap: One input parameter | + | |
− | + | '''Bubble Cap''': One input parameter | |
− | If not entered, ESP calculates diameter using Reference 1 as shown | + | |
− | in Item 1 for Sieve Tray. | + | * Column diameter (coldia): |
− | No other hydraulic information is required for the currently implemented | + | If not entered, ESP calculates diameter using Reference 1 as shown in Item 1 for Sieve Tray. No other hydraulic information is required for the currently implemented model. The model uses velocity of gas/liquid, density and surface tension to calculate gas holdup using a correlation which is a function of Bond number, Galileo number and Froude number. The model shows that the effect of the diameter of the single gas inlet orifice to the column diameter can be ruled out. The model then calculates interfacial area and mass transfer coefficients using above information and calculated Schimdt number and Sherwood number. Details of the OLI’s bubble column model can be found in Reference 5. |
− | model. The model uses velocity of gas/liquid, density and surface tension | + | |
− | |||
− | to calculate gas holdup using a correlation which is a function of Bond | ||
− | number, Galileo number and Froude number. The model shows that the effect | ||
− | of the diameter of the single gas inlet orifice to the column diameter | ||
− | can be ruled out. The model then calculates interfacial area and mass | ||
− | transfer coefficients using above information and calculated Schimdt | ||
− | number and Sherwood number. Details of the OLI’s bubble column model can | ||
− | be found in Reference 5. | ||
Reference 5: Akita, K. and Yoshida, F., “Gas holdup and volumetric | Reference 5: Akita, K. and Yoshida, F., “Gas holdup and volumetric | ||
mass transfer coefficient in bubble columns”, Industrial & Engineering | mass transfer coefficient in bubble columns”, Industrial & Engineering | ||
Chemistry Process Design & Development, 12(1) (1973), 76-80. | Chemistry Process Design & Development, 12(1) (1973), 76-80. | ||
− | Q2. Output report for trays | + | |
− | Sieve Tray: ESP currently shows the Sieve Tray Report which is accessible | + | == Q2. Output report for trays == |
− | through Packed Column Report. It is apparent that accessing Sieve Tray | + | |
− | Report through the Packed Column Report may not be a good idea, but we | + | '''Sieve Tray''': ESP currently shows the Sieve Tray Report which is accessible through Packed Column Report. It is apparent that accessing Sieve Tray Report through the Packed Column Report may not be a good idea, but we have decided to change the entry name in the column profiles (i.e., Packing/Tray Report). Currently, we report the column diameter at the end of the Sieve Tray Report, however, area can be added too. |
− | have decided to change the entry name in the column profiles (i.e., | + | |
− | Packing/Tray Report). Currently, we report the column diameter at the | + | '''Valve Tray''': ESP shows the Valve Tray Report which is accessible through Packed Column Report. |
− | end of the Sieve Tray Report, however, area can be added too. | + | |
− | + | '''Bubble Cap Tray''': ESP shows the Bubble Cap Report which is accessible | |
− | Valve Tray: ESP shows the Valve Tray Report which is accessible through | ||
− | Packed Column Report. | ||
− | |||
− | Bubble Cap Tray: ESP shows the Bubble Cap Report which is accessible | ||
through Packed Column Report. | through Packed Column Report. | ||
Column diameter is also reported at the end of each report. We can report | Column diameter is also reported at the end of each report. We can report | ||
the area of stage. Let us know what other useful information can be | the area of stage. Let us know what other useful information can be | ||
reported. | reported. | ||
− | Q3: Major simulator has the functionality by which calculated pressure | + | |
− | drop is automatically reflected to column pressure drop. Can ESP model | + | == Q3: Major simulator has the functionality by which calculated pressure drop is automatically reflected to column pressure drop. Can ESP model have the same? == |
− | have the same? | + | |
Pressure profile is a user input parameter for OLI’s column and is not | Pressure profile is a user input parameter for OLI’s column and is not | ||
an estimate. ESP does not recalculate the pressure profile or pressure | an estimate. ESP does not recalculate the pressure profile or pressure | ||
drop in the column, and apply back to column and converge. ESP only | drop in the column, and apply back to column and converge. ESP only | ||
interpolates to match the user provided pressure profiles. | interpolates to match the user provided pressure profiles. |
Latest revision as of 12:06, 7 June 2016
Q1: What are the default input data currently used with each tray type?
Sieve Tray: Four input parameters
- . Column diameter (coldia):
- . Weir height (hweir):
- Clear liquid height (hl):
- . Froth height (hf):
- Column diameter (coldia):
- Weir height (hweir):
- Column diameter (coldia):
If not entered, ESP calculates diameter using Reference 1. su = 0.65d0/dsqrt(denv*0.062428d0) calcdiam = dsqrt(av*4.0d0/(pi*su))
where,
su = Superficial gas velocity, m/sec
denv = Vapor density, kg/m3
av = Vapor flow rate, m3/sec
0.65 = Gas phase kinetic-energy term (F factor), unit-less
calcdiam = calculated diameter, m
Please note, unit conversions are not shown in the equations.
Reference 1: Perry’s Chemical Engineer’s handbook, 6th Edition, pages 18-6.
If not entered, hweir = 1.0 inch.
If not entered, ESP calculates the clear liquid height or the height of crest over wire (hl) using Reference 2.
hl = 664.d0*(al/lw)**(0.667)*1.0d-3
where
al = Liquid flow rate, m3/sec
lw = Weir length, m
hl = Clear liquid height, m
The weir length (lw) is calculated from a correlation using Reference 2.
lw = exp(log(al/6.309d-5)/25)/2.5d0 * 0.3048d0
Reference 2: Perry’s Chemical Engineer’s handbook, 6th Edition, pages 18-10,11.
If not entered,
hf = 2.0*hl.
For sieve tray, the weir length information is accounted in our model. Weir height is the only parameter set as default unless it is a user input. Hole diameter and/or arrangements are not required in the currently implemented model, however, current model uses above information plus diffusivity, Schimdt number, porosity of froth and other readily available data to calculate interfacial area per unit froth volume and finally mass transfer coefficients in the gas and liquid phase. More details about OLI’s Sieve tray can be found in Reference 3.
Reference 3: Moniuk, W., Bekassy-Molnar, E., Mustafa, H. and Pohorecki, R., “Absorption of carbon dioxide into sodium hydroxide solutions in a sieve plate column”, Hungarian Journal of Industrial Chemistry, 17 (1989), 93-105.
Valve Tray: Two input parameters
If not entered, ESP calculates diameter using Reference 1 as shown in Item 1 for Sieve Tray.
If not entered, hweir = 1.0 inch . No other information is required for the currently implemented model. The valve tray model uses flow rates, Reynolds number, Schimdt number and above two tray hydraulics data to calculate interfacial area and finally mass transfer coefficients. Details of the OLI’s Valve tray model can be found in Reference 4.
Reference 4: Scheffe, R.D. and Weiland, R.H., “Mass-Transfer Characteristics of Valve Trays”, Industrial & Engineering Chemistry Research 26 (1987), 228-236.
Bubble Cap: One input parameter
If not entered, ESP calculates diameter using Reference 1 as shown in Item 1 for Sieve Tray. No other hydraulic information is required for the currently implemented model. The model uses velocity of gas/liquid, density and surface tension to calculate gas holdup using a correlation which is a function of Bond number, Galileo number and Froude number. The model shows that the effect of the diameter of the single gas inlet orifice to the column diameter can be ruled out. The model then calculates interfacial area and mass transfer coefficients using above information and calculated Schimdt number and Sherwood number. Details of the OLI’s bubble column model can be found in Reference 5.
Reference 5: Akita, K. and Yoshida, F., “Gas holdup and volumetric mass transfer coefficient in bubble columns”, Industrial & Engineering Chemistry Process Design & Development, 12(1) (1973), 76-80.
Q2. Output report for trays
Sieve Tray: ESP currently shows the Sieve Tray Report which is accessible through Packed Column Report. It is apparent that accessing Sieve Tray Report through the Packed Column Report may not be a good idea, but we have decided to change the entry name in the column profiles (i.e., Packing/Tray Report). Currently, we report the column diameter at the end of the Sieve Tray Report, however, area can be added too.
Valve Tray: ESP shows the Valve Tray Report which is accessible through Packed Column Report.
Bubble Cap Tray: ESP shows the Bubble Cap Report which is accessible through Packed Column Report. Column diameter is also reported at the end of each report. We can report the area of stage. Let us know what other useful information can be reported.
Q3: Major simulator has the functionality by which calculated pressure drop is automatically reflected to column pressure drop. Can ESP model have the same?
Pressure profile is a user input parameter for OLI’s column and is not an estimate. ESP does not recalculate the pressure profile or pressure drop in the column, and apply back to column and converge. ESP only interpolates to match the user provided pressure profiles.